Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 362 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S
new file mode 100644
index 000000000000..0696ed4b9d64
--- /dev/null
+++ b/arch/sparc64/kernel/rtrap.S
@@ -0,0 +1,362 @@
+/* $Id: rtrap.S,v 1.61 2002/02/09 19:49:31 davem Exp $
+ * rtrap.S: Preparing for return from trap on Sparc V9.
+ *
+ * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <linux/config.h>
+
+#include <asm/asi.h>
+#include <asm/pstate.h>
+#include <asm/ptrace.h>
+#include <asm/spitfire.h>
+#include <asm/head.h>
+#include <asm/visasm.h>
+#include <asm/processor.h>
+
+#define		RTRAP_PSTATE		(PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE)
+#define		RTRAP_PSTATE_IRQOFF	(PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV)
+#define		RTRAP_PSTATE_AG_IRQOFF	(PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG)
+
+		/* Register %l6 keeps track of whether we are returning
+		 * from a system call or not.  It is cleared if we call
+		 * do_notify_resume, and it must not be otherwise modified
+		 * until we fully commit to returning to userspace.
+		 */
+
+		.text
+		.align			32
+__handle_softirq:
+		call			do_softirq
+		 nop
+		ba,a,pt			%xcc, __handle_softirq_continue
+		 nop
+__handle_preemption:
+		call			schedule
+		 wrpr			%g0, RTRAP_PSTATE, %pstate
+		ba,pt			%xcc, __handle_preemption_continue
+		 wrpr			%g0, RTRAP_PSTATE_IRQOFF, %pstate
+
+__handle_user_windows:
+		call			fault_in_user_windows
+		 wrpr			%g0, RTRAP_PSTATE, %pstate
+		wrpr			%g0, RTRAP_PSTATE_IRQOFF, %pstate
+		/* Redo sched+sig checks */
+		ldx			[%g6 + TI_FLAGS], %l0
+		andcc			%l0, _TIF_NEED_RESCHED, %g0
+
+		be,pt			%xcc, 1f
+		 nop
+		call			schedule
+		 wrpr			%g0, RTRAP_PSTATE, %pstate
+		wrpr			%g0, RTRAP_PSTATE_IRQOFF, %pstate
+		ldx			[%g6 + TI_FLAGS], %l0
+
+1:		andcc			%l0, (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING), %g0
+		be,pt			%xcc, __handle_user_windows_continue
+		 nop
+		clr			%o0
+		mov			%l5, %o2
+		mov			%l6, %o3
+		add			%sp, PTREGS_OFF, %o1
+		mov			%l0, %o4
+
+		call			do_notify_resume
+		 wrpr			%g0, RTRAP_PSTATE, %pstate
+		wrpr			%g0, RTRAP_PSTATE_IRQOFF, %pstate
+		clr			%l6
+		/* Signal delivery can modify pt_regs tstate, so we must
+		 * reload it.
+		 */
+		ldx			[%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
+		sethi			%hi(0xf << 20), %l4
+		and			%l1, %l4, %l4
+		ba,pt			%xcc, __handle_user_windows_continue
+
+		 andn			%l1, %l4, %l1
+__handle_perfctrs:
+		call			update_perfctrs
+		 wrpr			%g0, RTRAP_PSTATE, %pstate
+		wrpr			%g0, RTRAP_PSTATE_IRQOFF, %pstate
+		ldub			[%g6 + TI_WSAVED], %o2
+		brz,pt			%o2, 1f
+		 nop
+		/* Redo userwin+sched+sig checks */
+		call			fault_in_user_windows
+
+		 wrpr			%g0, RTRAP_PSTATE, %pstate
+		wrpr			%g0, RTRAP_PSTATE_IRQOFF, %pstate
+		ldx			[%g6 + TI_FLAGS], %l0
+		andcc			%l0, _TIF_NEED_RESCHED, %g0
+		be,pt			%xcc, 1f
+
+		 nop
+		call			schedule
+		 wrpr			%g0, RTRAP_PSTATE, %pstate
+		wrpr			%g0, RTRAP_PSTATE_IRQOFF, %pstate
+		ldx			[%g6 + TI_FLAGS], %l0
+1:		andcc			%l0, (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING), %g0
+
+		be,pt			%xcc, __handle_perfctrs_continue
+		 sethi			%hi(TSTATE_PEF), %o0
+		clr			%o0
+		mov			%l5, %o2
+		mov			%l6, %o3
+		add			%sp, PTREGS_OFF, %o1
+		mov			%l0, %o4
+		call			do_notify_resume
+
+		 wrpr			%g0, RTRAP_PSTATE, %pstate
+		wrpr			%g0, RTRAP_PSTATE_IRQOFF, %pstate
+		clr			%l6
+		/* Signal delivery can modify pt_regs tstate, so we must
+		 * reload it.
+		 */
+		ldx			[%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
+		sethi			%hi(0xf << 20), %l4
+		and			%l1, %l4, %l4
+		andn			%l1, %l4, %l1
+		ba,pt			%xcc, __handle_perfctrs_continue
+
+		 sethi			%hi(TSTATE_PEF), %o0
+__handle_userfpu:
+		rd			%fprs, %l5
+		andcc			%l5, FPRS_FEF, %g0
+		sethi			%hi(TSTATE_PEF), %o0
+		be,a,pn			%icc, __handle_userfpu_continue
+		 andn			%l1, %o0, %l1
+		ba,a,pt			%xcc, __handle_userfpu_continue
+
+__handle_signal:
+		clr			%o0
+		mov			%l5, %o2
+		mov			%l6, %o3
+		add			%sp, PTREGS_OFF, %o1
+		mov			%l0, %o4
+		call			do_notify_resume
+		 wrpr			%g0, RTRAP_PSTATE, %pstate
+		wrpr			%g0, RTRAP_PSTATE_IRQOFF, %pstate
+		clr			%l6
+
+		/* Signal delivery can modify pt_regs tstate, so we must
+		 * reload it.
+		 */
+		ldx			[%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
+		sethi			%hi(0xf << 20), %l4
+		and			%l1, %l4, %l4
+		ba,pt			%xcc, __handle_signal_continue
+		 andn			%l1, %l4, %l1
+
+		.align			64
+		.globl			rtrap_irq, rtrap_clr_l6, rtrap, irqsz_patchme, rtrap_xcall
+rtrap_irq:
+rtrap_clr_l6:	clr			%l6
+rtrap:
+		ldub			[%g6 + TI_CPU], %l0
+		sethi			%hi(irq_stat), %l2	! &softirq_active
+		or			%l2, %lo(irq_stat), %l2	! &softirq_active
+irqsz_patchme:	sllx			%l0, 0, %l0
+		lduw			[%l2 + %l0], %l1	! softirq_pending
+		cmp			%l1, 0
+
+		/* mm/ultra.S:xcall_report_regs KNOWS about this load. */
+		bne,pn			%icc, __handle_softirq
+		 ldx			[%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
+__handle_softirq_continue:
+rtrap_xcall:
+		sethi			%hi(0xf << 20), %l4
+		andcc			%l1, TSTATE_PRIV, %l3
+		and			%l1, %l4, %l4
+		bne,pn			%icc, to_kernel
+		 andn			%l1, %l4, %l1
+
+		/* We must hold IRQs off and atomically test schedule+signal
+		 * state, then hold them off all the way back to userspace.
+		 * If we are returning to kernel, none of this matters.
+		 *
+		 * If we do not do this, there is a window where we would do
+		 * the tests, later the signal/resched event arrives but we do
+		 * not process it since we are still in kernel mode.  It would
+		 * take until the next local IRQ before the signal/resched
+		 * event would be handled.
+		 *
+		 * This also means that if we have to deal with performance
+		 * counters or user windows, we have to redo all of these
+		 * sched+signal checks with IRQs disabled.
+		 */
+to_user:	wrpr			%g0, RTRAP_PSTATE_IRQOFF, %pstate
+		wrpr			0, %pil
+__handle_preemption_continue:
+		ldx			[%g6 + TI_FLAGS], %l0
+		sethi			%hi(_TIF_USER_WORK_MASK), %o0
+		or			%o0, %lo(_TIF_USER_WORK_MASK), %o0
+		andcc			%l0, %o0, %g0
+		sethi			%hi(TSTATE_PEF), %o0
+		be,pt			%xcc, user_nowork
+		 andcc			%l1, %o0, %g0
+		andcc			%l0, _TIF_NEED_RESCHED, %g0
+		bne,pn			%xcc, __handle_preemption
+		 andcc			%l0, (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING), %g0
+		bne,pn			%xcc, __handle_signal
+__handle_signal_continue:
+		 ldub			[%g6 + TI_WSAVED], %o2
+		brnz,pn			%o2, __handle_user_windows
+		 nop
+__handle_user_windows_continue:
+		ldx			[%g6 + TI_FLAGS], %l5
+		andcc			%l5, _TIF_PERFCTR, %g0
+		sethi			%hi(TSTATE_PEF), %o0
+		bne,pn			%xcc, __handle_perfctrs
+__handle_perfctrs_continue:
+		 andcc			%l1, %o0, %g0
+
+		/* This fpdepth clear is necessary for non-syscall rtraps only */
+user_nowork:
+		bne,pn			%xcc, __handle_userfpu
+		 stb			%g0, [%g6 + TI_FPDEPTH]
+__handle_userfpu_continue:
+
+rt_continue:	ldx			[%sp + PTREGS_OFF + PT_V9_G1], %g1
+		ldx			[%sp + PTREGS_OFF + PT_V9_G2], %g2
+
+		ldx			[%sp + PTREGS_OFF + PT_V9_G3], %g3
+		ldx			[%sp + PTREGS_OFF + PT_V9_G4], %g4
+		ldx			[%sp + PTREGS_OFF + PT_V9_G5], %g5
+		mov			TSB_REG, %g6
+		brnz,a,pn		%l3, 1f
+		 ldxa			[%g6] ASI_IMMU, %g5
+1:		ldx			[%sp + PTREGS_OFF + PT_V9_G6], %g6
+		ldx			[%sp + PTREGS_OFF + PT_V9_G7], %g7
+		wrpr			%g0, RTRAP_PSTATE_AG_IRQOFF, %pstate
+		ldx			[%sp + PTREGS_OFF + PT_V9_I0], %i0
+		ldx			[%sp + PTREGS_OFF + PT_V9_I1], %i1
+
+		ldx			[%sp + PTREGS_OFF + PT_V9_I2], %i2
+		ldx			[%sp + PTREGS_OFF + PT_V9_I3], %i3
+		ldx			[%sp + PTREGS_OFF + PT_V9_I4], %i4
+		ldx			[%sp + PTREGS_OFF + PT_V9_I5], %i5
+		ldx			[%sp + PTREGS_OFF + PT_V9_I6], %i6
+		ldx			[%sp + PTREGS_OFF + PT_V9_I7], %i7
+		ldx			[%sp + PTREGS_OFF + PT_V9_TPC], %l2
+		ldx			[%sp + PTREGS_OFF + PT_V9_TNPC], %o2
+
+		ld			[%sp + PTREGS_OFF + PT_V9_Y], %o3
+		wr			%o3, %g0, %y
+		srl			%l4, 20, %l4
+		wrpr			%l4, 0x0, %pil
+		wrpr			%g0, 0x1, %tl
+		wrpr			%l1, %g0, %tstate
+		wrpr			%l2, %g0, %tpc
+		wrpr			%o2, %g0, %tnpc
+
+		brnz,pn			%l3, kern_rtt
+		 mov			PRIMARY_CONTEXT, %l7
+		ldxa			[%l7 + %l7] ASI_DMMU, %l0
+cplus_rtrap_insn_1:
+		sethi			%hi(0), %l1
+		sllx			%l1, 32, %l1
+		or			%l0, %l1, %l0
+		stxa			%l0, [%l7] ASI_DMMU
+		flush			%g6
+		rdpr			%wstate, %l1
+		rdpr			%otherwin, %l2
+		srl			%l1, 3, %l1
+
+		wrpr			%l2, %g0, %canrestore
+		wrpr			%l1, %g0, %wstate
+		wrpr			%g0, %g0, %otherwin
+		restore
+		rdpr			%canrestore, %g1
+		wrpr			%g1, 0x0, %cleanwin
+		retry
+		nop
+
+kern_rtt:	restore
+		retry
+to_kernel:
+#ifdef CONFIG_PREEMPT
+		ldsw			[%g6 + TI_PRE_COUNT], %l5
+		brnz			%l5, kern_fpucheck
+		 ldx			[%g6 + TI_FLAGS], %l5
+		andcc			%l5, _TIF_NEED_RESCHED, %g0
+		be,pt			%xcc, kern_fpucheck
+		 srl			%l4, 20, %l5
+		cmp			%l5, 0
+		bne,pn			%xcc, kern_fpucheck
+		 sethi			%hi(PREEMPT_ACTIVE), %l6
+		stw			%l6, [%g6 + TI_PRE_COUNT]
+		call			schedule
+		 nop
+		ba,pt			%xcc, rtrap
+		 stw			%g0, [%g6 + TI_PRE_COUNT]
+#endif
+kern_fpucheck:	ldub			[%g6 + TI_FPDEPTH], %l5
+		brz,pt			%l5, rt_continue
+		 srl			%l5, 1, %o0
+		add			%g6, TI_FPSAVED, %l6
+		ldub			[%l6 + %o0], %l2
+		sub			%l5, 2, %l5
+
+		add			%g6, TI_GSR, %o1
+		andcc			%l2, (FPRS_FEF|FPRS_DU), %g0
+		be,pt			%icc, 2f
+		 and			%l2, FPRS_DL, %l6
+		andcc			%l2, FPRS_FEF, %g0
+		be,pn			%icc, 5f
+		 sll			%o0, 3, %o5
+		rd			%fprs, %g1
+
+		wr			%g1, FPRS_FEF, %fprs
+		ldx			[%o1 + %o5], %g1
+		add			%g6, TI_XFSR, %o1
+		membar			#StoreLoad | #LoadLoad
+		sll			%o0, 8, %o2
+		add			%g6, TI_FPREGS, %o3
+		brz,pn			%l6, 1f
+		 add			%g6, TI_FPREGS+0x40, %o4
+
+		ldda			[%o3 + %o2] ASI_BLK_P, %f0
+		ldda			[%o4 + %o2] ASI_BLK_P, %f16
+1:		andcc			%l2, FPRS_DU, %g0
+		be,pn			%icc, 1f
+		 wr			%g1, 0, %gsr
+		add			%o2, 0x80, %o2
+		ldda			[%o3 + %o2] ASI_BLK_P, %f32
+		ldda			[%o4 + %o2] ASI_BLK_P, %f48
+
+1:		membar			#Sync
+		ldx			[%o1 + %o5], %fsr
+2:		stb			%l5, [%g6 + TI_FPDEPTH]
+		ba,pt			%xcc, rt_continue
+		 nop
+5:		wr			%g0, FPRS_FEF, %fprs
+		membar			#StoreLoad | #LoadLoad
+		sll			%o0, 8, %o2
+
+		add			%g6, TI_FPREGS+0x80, %o3
+		add			%g6, TI_FPREGS+0xc0, %o4
+		ldda			[%o3 + %o2] ASI_BLK_P, %f32
+		ldda			[%o4 + %o2] ASI_BLK_P, %f48
+		membar			#Sync
+		wr			%g0, FPRS_DU, %fprs
+		ba,pt			%xcc, rt_continue
+		 stb			%l5, [%g6 + TI_FPDEPTH]
+
+cplus_rinsn_1:
+		sethi			%uhi(CTX_CHEETAH_PLUS_NUC), %l1
+
+		.globl			cheetah_plus_patch_rtrap
+cheetah_plus_patch_rtrap:
+		/* We configure the dTLB512_0 for 4MB pages and the
+		 * dTLB512_1 for 8K pages when in context zero.
+		 */
+		sethi			%hi(cplus_rinsn_1), %o0
+		sethi			%hi(cplus_rtrap_insn_1), %o2
+		lduw			[%o0 + %lo(cplus_rinsn_1)], %o1
+		or			%o2, %lo(cplus_rtrap_insn_1), %o2
+		stw			%o1, [%o2]
+		flush			%o2
+
+		retl
+		 nop